Free-Space Optical Communications Over Lognormal Fading Channels Using OOK With Finite Extinction Ratios | Zendy

Luanxia Yang | Zendy; Xuegui Song | Zendy; Julian Cheng | Zendy; Jonathan F. Holzman | Zendy

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Free-Space Optical Communications Over Lognormal Fading Channels Using OOK With Finite Extinction Ratios

Author(s) -

Luanxia Yang,

Xuegui Song,

Julian Cheng,

Jonathan F. Holzman

Publication year - 2016

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2016.2520936

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

Free-space optical communication links operating over lognormal turbulence channels using on-off keying (OOK) are studied in this paper. Such systems can suffer from irreducible error floors that result from the use of demodulation with fixed and unoptimized detection thresholds. The resulting error floors are analyzed for the general case of low- and high-state offsets (i.e., finite extinction ratios). An electrical signal-to-noise ratio (SNR) optimized detection system is applied. The system uses the electrical SNRs to implement adaptive detection thresholds and eliminate the error floors. The system can accommodate operation with finite extinction ratios, as it uses the method of moments and maximum likelihhod estimation techniques to estimate the low- and high-state offsets and electrical SNR. Numerical results show that the SNR gap between the electrical-SNR-optimized detection system and the adaptive detection system is 2.3 dB at a bit-error rate of 10^-5 without a state offset. The SNR gap increases to 4.5 dB with a state offset of ξ=0.2 .

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